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CVE-2026-72225— jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.10版本至7.2-rc1之前版本存在安全漏洞，该漏洞源于jbd2_journal_initialize_fast_commit()函数在验证日志容量时存在整数下溢问题，当num_fc_blks超过j_last时，减法运算回绕绕过边界检查，导致日志中止。

CVSS 7.8 · High EPSS 0.17% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6866d7b3f2bb4f011041ba54c98b1584497fe2fd< aa90f00932bf572d6ef284c977c2a60b39c13bd6 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< e144ad0250f77e23e28949587b8b57e40dc3b512 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< fb9b49618ed7296ebfad62a3835da8945f727001 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 78955fdce8ff654e6d33a2fa90882a1e7eb26330 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< a58fc10adf503969fec2007b5afe8987258046c4 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 289a2ca0c9b7eae74f93fc213b0b971669b8683d affected
… +10 more rows
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I. Basic Information for CVE-2026-72225

Vulnerability Information
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Vulnerability Title
jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit() jbd2_journal_initialize_fast_commit() validates journal capacity by checking (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS). Both j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds j_last the subtraction wraps to a large value, bypassing the bounds check. The resulting underflow corrupts j_last, j_fc_first, and j_free, leading to journal abort. Fix by checking num_fc_blks against j_last before the subtraction, returning -EFSCORRUPTED.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.10版本至7.2-rc1之前版本存在安全漏洞，该漏洞源于jbd2_journal_initialize_fast_commit()函数在验证日志容量时存在整数下溢问题，当num_fc_blks超过j_last时，减法运算回绕绕过边界检查，导致日志中止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6866d7b3f2bb4f011041ba54c98b1584497fe2fd ~ aa90f00932bf572d6ef284c977c2a60b39c13bd6 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-72225

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III. Intelligence Information for CVE-2026-72225

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Patches & Fixes for CVE-2026-72225 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72398 9.8 CRITICAL sctp: add INIT verification after cookie unpacking
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72442 9.8 CRITICAL netfilter: flowtable: fix and simplify IP6IP6 tunnel handling
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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